package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RedisConstants;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.SystemConstants;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author Recall
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;
    @Autowired
    private UserMapper userMapper;

    @Override
    public Result sendCode(String phone, HttpSession session) {
        //1.校验手机号
        boolean phoneInvalid = RegexUtils.isPhoneInvalid(phone);
        //2.如果不符合，返回错误信息
        if (phoneInvalid) {
            //2.1.返回错误信息
            return Result.fail("手机号格式错误！");
        }
        //3.如果符合，生成验证码
        String code = RandomUtil.randomNumbers(6);
        //4.保存验证码到Redis
        stringRedisTemplate.opsForValue().set(RedisConstants.LOGIN_CODE_KEY + phone, code, RedisConstants.LOGIN_CODE_TTL, TimeUnit.MINUTES);

        //5.发送验证码
        log.debug("发送验证码成功！验证码为：{}", code);

        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        // 1.校验手机号
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)) {
            return Result.fail("手机号格式错误！");
        }
        // 2.校验验证码,从Redis中获取
        String cacheCode = stringRedisTemplate.opsForValue().get(RedisConstants.LOGIN_CODE_KEY + phone);
        // 3.不一致，报错
        String code = loginForm.getCode();
        if (!code.equals(cacheCode)) {
            return Result.fail("验证码错误！");
        }

        // 4.一致，根据手机号查询用户
        LambdaQueryWrapper<User> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.eq(User::getPhone, phone);
        User user = getOne(lambdaQueryWrapper);
        // 5.判断用户是否存在
        if (user == null) {
            // 5.1不存在，注册
            user = createUserWithPhone(phone);
        }
        // 6. 封装userDto对象
        UserDTO userDTO = new UserDTO();
        BeanUtils.copyProperties(user, userDTO);
        // 7.存在，写到Redis中
        // 7.1.生成一个随机token，作为登录令牌
        String token = UUID.randomUUID().toString(true);
        // 7.2.将UserDTO对象转为HashMap存储
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO, new HashMap<>(),
                CopyOptions.create().setIgnoreNullValue(true)
                        .setFieldValueEditor((fileName, fileValue) -> fileValue.toString()));
        // 7.3.存储
        String tokenKey = RedisConstants.LOGIN_USER_KEY + token;
        stringRedisTemplate.opsForHash().putAll(tokenKey, userMap);
        // 7.4.设置有效期
        stringRedisTemplate.expire(tokenKey, RedisConstants.LOGIN_USER_TTL, TimeUnit.MINUTES);
        // 8.返回token
        return Result.ok(token);
    }

    @Override
    public Result queryUserById(Long userId) {
        User user = userMapper.selectById(userId);
        if (user == null) {
            return Result.fail("用户不存在！");
        }
        UserDTO userDTO = new UserDTO();
        BeanUtils.copyProperties(user, userDTO);
        return Result.ok(userDTO);
    }

    @Override
    public Result sign() {
        // 1.获取当前登录的用户
        Long userId = UserHolder.getUser().getId();
        // 2.获取日期
        LocalDateTime now = LocalDateTime.now();
        // 3.拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = RedisConstants.USER_SIGN_KEY + userId + keySuffix;
        // 4.获取今天时本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        // 5.写入Redis SETBIT key offset 1
        stringRedisTemplate.opsForValue().setBit(key, dayOfMonth - 1, true);
        return Result.ok();
    }

    @Override
    public Result signCount() {
        // 1.获取当前登录的用户
        Long userId = UserHolder.getUser().getId();
        // 2.获取日期
        LocalDateTime now = LocalDateTime.now();
        // 3.拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = RedisConstants.USER_SIGN_KEY + userId + keySuffix;
        // 4.获取今天时本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        // 5.获取本月截止今天为止的所有的签到记录，返回的是一个十进制的数字
        List<Long> result = stringRedisTemplate.opsForValue().bitField(
                key,
                BitFieldSubCommands.create()
                        .get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth))
                        .valueAt(0)
        );
        if (result == null || result.isEmpty()) {
            // 没有任何签到结果
            return Result.ok(0);
        }
        Long num = result.get(0);
        if (num == null || num == 0L) {
            return Result.ok(0);
        }
        // 6.循环遍历
        int count = 0;
        // 如果为0，说明未签到，结束
        // 如果不为0，说明已签到，计数器加1
        while ((num & 1) != 0) {
            // 6.1.让这个数字与1做与运算，得到数字的最后一个bit位 // 判断这个bit位是否为0
            count++;
            // 把数字右移一位，抛弃最后一个bit位，继续下一个bit位
            num >>>= 1;
        }
        return Result.ok(count);
    }

    private User createUserWithPhone(String phone) {
        User user = new User();
        user.setPhone(phone);
        user.setNickName(SystemConstants.USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));
        save(user);
        return user;
    }
}
